$ svn sw http://svn.automattic.com/wordpress/tags/2.3
U    wp-pass.php
U    wp-rss.php
U    wp-login.php
...
Updated to revision 6166.

More information on the release can be found here: WordPress 2.3. Now you can tag your posts like it’s 2003!

Man, subversion is just the best thing since sliced bread. You can do it too! Easy to follow instructions can be found here:
Installing/Updating WordPress with Subversion.

I’m happy to walk anybody through the minutia of getting an svn install of WordPress set up for yourself (assuming you’re already comfortable with sshing to your webhost/server).